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For electrolytic capacitors, for historical reasons the dissipation factor tan δ will sometimes be specified in the data sheet instead of the ESR. The dissipation factor is determined by the tangent of the phase angle between the capacitive reactance X C minus the inductive reactance X L and the ESR .
Aluminium electrolytic capacitors are (usually) polarized electrolytic capacitors whose anode electrode (+) is made of a pure aluminium foil with an etched surface. The aluminum forms a very thin insulating layer of aluminium oxide by anodization that acts as the dielectric of the capacitor.
Capacitors and inductors as used in electric circuits are not ideal components with only capacitance or inductance. However, they can be treated, to a very good degree of approximation, as being ideal capacitors and inductors in series with a resistance ; this resistance is defined as the equivalent series resistance ( ESR ).
Electrolytic capacitors differ from other capacitor types, whose capacitances are typically measured at 1 kHz or higher. For tantalum capacitors a DC bias voltage of 1.1 to 1.5 V for types with a rated voltage of ≤2.5 V or 2.1 to 2.5 V for types with a rated voltage of >2.5 V may be applied during the measurement to avoid reverse voltage.
In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other.
U – Vacuum capacitor; XL – Glow modulator tube, flash tube, gas laser; Examples: B142 – 400 W RF power triode up to 50 MHz similar to 833A; B1109 = 3C24 – 25 W VHF power triode up to 60 MHz; B1135 = 5867 = CV1350 – VHF power triode up to 100 MHz; B1152 – 500W RF power triode up to 50 MHz
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